The monoenergetic beam of electrons moving along $+ y$ direction enters a region of uniform electric and magnetic fields. If the beam goes straight undeflected, then fields $B$ and $E$ are directed respectively along
The monoenergetic beam of electrons moving along $+ y$ direction enters a region of uniform electric and magnetic fields. If the beam goes straight undeflected, then fields $B$ and $E$ are directed respectively along
- A
$- y$ axis and $- z$ axis
- B
$+ z$ axis and $+ x$ axis
- C
$+ x$ axis and $+ z$ axis
- D
$- x$ axis and $- y$ axis
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